Re: [PATCHSET v3 sched_ext/for-7.1] sched_ext: Implement cgroup sub-scheduler support

[Tejun Heo <tj@kernel.org>]

> Tejun Heo (34):
>  sched_ext: Implement cgroup subtree iteration for scx_task_iter
>  sched_ext: Add @kargs to scx_fork()
>  sched/core: Swap the order between sched_post_fork() and cgroup_post_fork()
>  cgroup: Expose some cgroup helpers
>  sched_ext: Update p->scx.disallow warning in scx_init_task()
>  sched_ext: Reorganize enable/disable path for multi-scheduler support
>  sched_ext: Introduce cgroup sub-sched support
>  sched_ext: Introduce scx_task_sched[_rcu]()
>  sched_ext: Introduce scx_prog_sched()
>  sched_ext: Enforce scheduling authority in dispatch and select_cpu operations
>  sched_ext: Enforce scheduler ownership when updating slice and dsq_vtime
>  sched_ext: scx_dsq_move() should validate the task belongs to the right scheduler
>  sched_ext: Refactor task init/exit helpers
>  sched_ext: Make scx_prio_less() handle multiple schedulers
>  sched_ext: Move default slice to per-scheduler field
>  sched_ext: Move aborting flag to per-scheduler field
>  sched_ext: Move bypass_dsq into scx_sched_pcpu
>  sched_ext: Move bypass state into scx_sched
>  sched_ext: Prepare bypass mode for hierarchical operation
>  sched_ext: Factor out scx_dispatch_sched()
>  sched_ext: When calling ops.dispatch() @prev must be on the same scx_sched
>  sched_ext: Separate bypass dispatch enabling from bypass depth tracking
>  sched_ext: Implement hierarchical bypass mode
>  sched_ext: Dispatch from all scx_sched instances
>  sched_ext: Move scx_dsp_ctx and scx_dsp_max_batch into scx_sched
>  sched_ext: Make watchdog sub-sched aware
>  sched_ext: Convert scx_dump_state() spinlock to raw spinlock
>  sched_ext: Support dumping multiple schedulers and add scheduler identification
>  sched_ext: Implement cgroup sub-sched enabling and disabling
>  sched_ext: Add scx_sched back pointer to scx_sched_pcpu
>  sched_ext: Make scx_bpf_reenqueue_local() sub-sched aware
>  sched_ext: Factor out scx_link_sched() and scx_unlink_sched()
>  sched_ext: Add rhashtable lookup for sub-schedulers
>  sched_ext: Add basic building blocks for nested sub-scheduler dispatching

Applied to sched_ext/for-7.1 with the following updates:

- #4 applied to cgroup/for-7.1 and pulled into sched_ext/for-7.1.
- #23: Fix comment typos (Andrea).
- #29: Fix missing scx_cgroup_unlock()/percpu_up_write() in abort path
  (Cheng-Yang Chou).

Thanks.

--
tejun